Compilare: user.cpp: In function ‘void decompose()’: user.cpp:67:7: warning: unused variable ‘invers’ [-Wunused-variable] int invers, y; ^ user.cpp:67:15: warning: unused variable ‘y’ [-Wunused-variable] int invers, y; ^ user.cpp:70:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^ user.cpp: In function ‘int main()’: user.cpp:107:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssnd.in", "rt", stdin); ^ user.cpp:108:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ssnd.out", "wt", stdout); ^ user.cpp:113:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^